28712251 has 2 divisors, whose sum is σ = 28712252. Its totient is φ = 28712250.

The previous prime is 28712239. The next prime is 28712263. The reversal of 28712251 is 15221782.

It is a balanced prime because it is at equal distance from previous prime (28712239) and next prime (28712263).

It is a cyclic number.

It is not a de Polignac number, because 28712251 - 2²³ = 20323643 is a prime.

It is not a weakly prime, because it can be changed into another prime (28712051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14356125 + 14356126.

It is an arithmetic number, because the mean of its divisors is an integer number (14356126).

Almost surely, 2^28712251 is an apocalyptic number.

28712251 is a deficient number, since it is larger than the sum of its proper divisors (1).

28712251 is an equidigital number, since it uses as much as digits as its factorization.

28712251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2240, while the sum is 28.

The square root of 28712251 is about 5358.3813787374. The cubic root of 28712251 is about 306.2121465917.

The spelling of 28712251 in words is "twenty-eight million, seven hundred twelve thousand, two hundred fifty-one".